package com.boot.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;

/**
 * Created  on 2018/7/5 10:51.
 * 作者: Dengjb
 * 说明:
 */
@RestController
public  class FileController {

	@Value("${web.upload-path}")
	private String uploadPath;
	@RequestMapping(value = "/upload")
	public String upload(@RequestParam("file") MultipartFile file) {
		try {
			if (file.isEmpty()) {
				return "文件为空";
			}
			// 获取文件名
			String fileName = file.getOriginalFilename();
			// 获取文件的后缀名
			String suffixName = fileName.substring(fileName.lastIndexOf("."));
			// 设置文件存储路径
			String path = uploadPath + "/"+fileName;
			File dest = new File(path);
			// 检测是否存在目录
			if (!dest.getParentFile().exists()) {
				dest.getParentFile().mkdirs();// 新建文件夹
			}
			file.transferTo(dest);// 文件写入
			return "上传成功";
		} catch (IllegalStateException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return "上传失败";
	}

	@PostMapping("/batch")
	public String handleFileUpload(HttpServletRequest request) {
		List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
		MultipartFile file = null;
		BufferedOutputStream stream = null;
		for (int i = 0; i < files.size(); ++i) {
			file = files.get(i);
			if (!file.isEmpty()) {
				try {
					byte[] bytes = file.getBytes();
					stream = new BufferedOutputStream(new FileOutputStream(
							new File(uploadPath + file.getOriginalFilename())));//设置文件路径及名字
					stream.write(bytes);// 写入
					stream.close();
				} catch (Exception e) {
					stream = null;
					return "第 " + i + " 个文件上传失败 ==> "
							+ e.getMessage();
				}
			} else {
				return "第 " + i
						+ " 个文件上传失败因为文件为空";
			}
		}
		return "上传成功";
	}

	@GetMapping("/download")
	public String downloadFile(HttpServletRequest request, HttpServletResponse response) {
		String fileName = "拓普学堂.pdf";// 文件名
		if (fileName != null) {
			//设置文件路径
			File file = new File(uploadPath+fileName);
			//File file = new File(realPath , fileName);
			if (file.exists()) {
				response.setContentType("application/force-download");// 设置强制下载不打开
				response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);// 设置文件名
				byte[] buffer = new byte[1024];
				FileInputStream fis = null;
				BufferedInputStream bis = null;
				try {
					fis = new FileInputStream(file);
					bis = new BufferedInputStream(fis);
					OutputStream os = response.getOutputStream();
					int i = bis.read(buffer);
					while (i != -1) {
						os.write(buffer, 0, i);
						i = bis.read(buffer);
					}
					return "下载成功";
				} catch (Exception e) {
					e.printStackTrace();
				} finally {
					if (bis != null) {
						try {
							bis.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
					if (fis != null) {
						try {
							fis.close();
						} catch (IOException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}
		return "下载失败";
	}
}
